Isviprqvelvlent in sewing-machines



G. w. BAKER.

lmprovement in Sewing Machines.

N0. 5,925-4 l l Patented June13,87l.

Tegl.

GEORGE NV. BAKR, OF YVILMINGTON, DELAVARE.

iMPROVEMENTlN SEWiNGMACHINES.

Specification forming part of Letters Patent No. 115,925, dated June i3, 187i.

i i Y full, clear,and exact description ofthe construction and opera-tion of the same, reference being had to the annexed drawing making a part of this specification and to the letters and figures of reference marked thereon.

Figure l ot' the drawing is an end view of invention. Fig. 2 is a side view. Fig. 3 is a bottorn view. Figs. 4 and 5 are details.

This invention has relation to sewing-machines; and it consists in improvements there in, the object being the production of a ma chine the principal part of which is above the table, the peculiar construction and purpose of which are hereinafter fully set forth.

Referring to the drawing, A represents a table, of suitable form and dimensions, upon which is fixed the supporting-arm B B1, which is constructed in the general form shown in Fig. 2,having an elbow, B2, and forks, B3 and B4, and the necessarybearings and perforations to sustain the machinery. The wheel C has a lateral pulley, c, for the application of the belt from the driving-wheel, and an outer edge adapted to the application of the hand of the operator. Itis placed on the outer end of the sha-ft D, which is supported in longitudinal bearings in the arm B B1. On the inner end of the shaft D is iixed the disk e, which has a peculiar lateral cam, el, in the shape of an oblique section of a cylinder, and also a cam-disk, e2, which has on one side, near its outer edge, the projectingpin f. The rod gpasses through vertical perforations or bearings in the forks B3 and B4 and the table A, and beneath the table the rod is bentor formed into the shape shown at g1, Fig. 3, and at its extremity is provided with an eye, g2.' The arm g1 andthe eye f2 serve as a guide and support for the thread. Above the cam e1 the rod has a projection, It, bent downward, as shown; and at its upper end it has a spiral spring, so fixed on it and in the bearing as to cause the projection h to press against the side of the cam el, which, as it revolves, imparts to the rod g, and consequently the arm g1 and its eye g2, an alternating reverse motion, by which the thread is put in proper position to be taken up by the needle. Bc-

tween the disks e and e2, on the shaft D, are the eccentric and ring e3. The ring e3 has an arm, which is connected, in an adjustable manner, by means of a set-screw, which is also a crank-pin and a slot to the arm k of the crank lla k1 k2, which is shaped as shown, and has its bearings on the fork B4. The arm lof the crank is connected by a link, k3, Fig. l, to the lneedle-plate Z, to which it communicates a vibrating motion, the plate Z oscillating on the pivot l, that connects it to the fork B3. The needle-bar and guard-bar m and m slide up and down through holes in lateral projections on the Vends of the plate Z. The bar m has fixed about its middle a grooved guide, a, Fig. 4, in which, as the disk c2 revolves, the pin f moves and imparts to the guide a, and consequently to the needle-bar m, a vertical alternatin g reverse motion. The bars m and m have, near their upper ends,pins or proj ections, as shown, by the means of which the bar m' is moved up and down, and its downward motion is suspended. The bar m supports, at its lower end,the straight needle o, which has, at its point, a notch, o', for the purpose of catching and' drawing up the thread. y The bar m supports, at its lower end, a guard, p, for the purpose of sliding over the notch o after the thread is caught, to keep the thread in the notch until the stitch is taken, and until the downward motion of the bar mf, and consequently of the guard p, is suspended, as aforesaid, and the notch uncovered. The spool is placed on the projection q, and the thread passed through an eye in the guide g', the perforation 1' in the table A, an eye on the end of the tension-spring -s, which is attached to the underside of the table, the eye g2 in the arm g1, andthe opening t in the table, through which the needle passes to catch the thread. The pressenrod b passes through holes in the forks B3 and B4, and is supported and regulated by means of a cam, b1, and a spiral spring, b2. From the lower end of the presser-rod projects 'the presser-foot x, through which the needle passes. An' arm, z", isrigidly attached to the presser-rod b, and has its bearing on the top of f the cam-disk e2, which is so arranged, relatively, with respect to the devices which move the needle, that the presser-foot will belifted while the needle is feeding the work. Thus the work will be allowed to move freely without hindrance from the Vspring b2, which operates to keep the presser-foot down only when the needle is raised out of the work. As the needle passes up and down it also has, with the needle-plate, a lateral motion, and, consequently, at every stitch, the material being sewed is drawn along or fed to the machine.

One great peculiarity and novelty of this machine is that, with the exception of the tensionspring s and the arm g1 g2, it is all above the tablea feature that especially adapts it to the sewing of such things as are wet, or saturated or covered with something, as an acid, that will oxidize the machinery by coming in contact with it. Machines that have the principal part of the machinery under the table are soon spoiled by such use on account of oxidation.

Improvements in tanning hides renderit necessary to sew their edges together while they are wet with a necessary preparation to form them into bags to be lled with the solution of the tannin used. This machine is, therefore, particularly suited for the use of tanners. It also forms the chain-stitch, which is preferable for tannersusc on account of the sewing being easily ripped out.

I claim as my inventionrljhe arrangement on the shaft ofthe disk e having lateral eccentric e1, and rod g having projection h, reacting spring h', and arms g1 g2, all constructed and arranged with reference to the frame A B, substantially as and for the purpose specified.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

GEORGE W. BAKER.

lVitnesses:

JOSEPH T. MARSHALL, E. J. DOUGHERTY. 

